A physiological phenomenon that usually occurs while descending a mountain after hours of strenuous hiking, where the legs become very sloppy, fatigued, and uncoordinated, thus resembling either brittle, or well boiled pieces of spaghetti.

"Oh-man, I got the Spaghetti Legs, this hike was harder than I thought!"

"I think it's time invest in some trekking poles to help with these Spaghetti Legs!"

The Urban Dictionary Mug

A VERY lame dance move, most likely used by someone who doesn't know how to properly dance.
It involves the "dancer" to walk around with their legs wobbling around like they have no knees, thus giving it a spaghetti resemblance.
It frequently scares the female population, although most females don't want to admit how horrifying it is in case it hurts the "dancers" feelings.

Mark: Hey guys!!! Check out my spaghetti legs!!!!

The Crew: Oh God......(Looking away in embarassment and hope that it will stop before anyone else sees)